Feature:1. [Noise Cancellation] Telephone headset with HD noise cancelling mic, which can be twisted at will; less noise and clearer sound, providing clear conversations in noisy environments.2. [Easy To Use] 2.5mm plug phone headset, plug and play, no driver required. Support speaker volume adjustment and microphone mute. The long headphone cable provides flexibility on the move.3. [All Day Comfort] Ultra lightweight headphone, soft ear pads and flexible headband do not put any strain on your ears, providing long lasting comfort so you can concentrate on talking and working.4. [Sturdy And Durable] Wired business headphone has a sturdy construction, made of high quality ABS material to ensure super performance, and durable for long term use.5. [Compatible] Business headset works with devices with a 2.5mm headphone jack. Ideal for home, offices, call centers, telemarketing, customer service, conference calls, and more.How to Use:Plug and play.Specification:Item Type: Telephone HeadsetMaterial: ABSModel: H390D 2.5MVColor: BlackType: BinauralPlug: 2.5mm PlugFunction: Call, Speaker Volume Adjustment, Microphone MuteScope of Application: Compatible with Devices with 2.5mm Headphone JackSpeaker Parameters:Sensitivity: 105±3dB (at 178mV 1kHz)Voice Coil Impedance: 150±15Ω (at 1kHz)Frequency Characteristics: 100Hz-10kHzDistortion: ≤5% (at 178mV 1kHz)Microphone Parameters:Directivity: Single PointSensitivity: -40±2dB (2.0V, 2.2KΩ, 1kHz)Distortion: ≤5% (at 4.5V 2.2KΩ 1kHz)Frequency Characteristics: 200Hz-6kHzCurrent Consumption: 100-500µA Package List:1 x Telephone Headset